CN102984530B - Image processing system and Atomatic focusing method - Google Patents

Image processing system and Atomatic focusing method Download PDF

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Publication number
CN102984530B
CN102984530B CN201110302436.2A CN201110302436A CN102984530B CN 102984530 B CN102984530 B CN 102984530B CN 201110302436 A CN201110302436 A CN 201110302436A CN 102984530 B CN102984530 B CN 102984530B
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camera
image
target piece
focal length
image processing
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CN102984530A (en
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苏文岳
林君达
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HTC Corp
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High Tech Computer Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/204—Image signal generators using stereoscopic image cameras
    • H04N13/239—Image signal generators using stereoscopic image cameras using two 2D image sensors having a relative position equal to or related to the interocular distance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/296—Synchronisation thereof; Control thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/95—Computational photography systems, e.g. light-field imaging systems
    • H04N23/958—Computational photography systems, e.g. light-field imaging systems for extended depth of field imaging
    • H04N23/959—Computational photography systems, e.g. light-field imaging systems for extended depth of field imaging by adjusting depth of field during image capture, e.g. maximising or setting range based on scene characteristics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N2013/0074—Stereoscopic image analysis
    • H04N2013/0081—Depth or disparity estimation from stereoscopic image signals

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Computing Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Studio Devices (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Automatic Focus Adjustment (AREA)
  • Measurement Of Optical Distance (AREA)

Abstract

The invention provides a kind of image processing system and Atomatic focusing method, this image processing system comprises a first camera, a second camera and an automatic focusing module.This first camera takes pictures to produce one first image to a region.This second camera takes pictures to produce one second image to this region, wherein there is a parallax between this first image and this second image.This automatic focusing module adjusts the focal length of this first camera and this second camera according to this parallax.

Description

Image processing system and Atomatic focusing method
Technical field
The present invention relates to image, particularly the auto-focusing of image.
Background technology
When camera carries out photographic images, the adjustment of focal length must be carried out camera lens, just can make the photo-sensitive cell of photoimaging in camera of incident camera lens.The process of this Focussing is referred to as focusing.The definition (accuracy) making captured image reach high, focus process must be very accurate, to make incident light really focus on photo-sensitive cell, and makes the image that photo-sensitive cell is formed reach enough definition.Therefore, focus process is often very consuming time.
Current general higher digital camera all has the function of auto-focusing.But general automatic focusing function, is progressively adjusted the focal length of camera lens by digital camera, then detect the image that photo-sensitive cell is formed and whether reach enough definition.When the image that photo-sensitive cell is formed does not reach enough definition, digital camera just adjusts the focal length of camera lens once again.And the Focussing of general digital camera is reached by the relative distance of the convex lens in stepper motor moving lens and concavees lens.Process so repeatedly makes whole auto-focus process very consuming time, causes the inconvenience of user's photographic images.If the time of auto-focus process can be shortened, then significantly can promote the usefulness of camera.Therefore, a kind of method of auto-focusing is needed.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of image processing system, to solve known technology Problems existing.In one embodiment, this image processing system comprises a first camera, a second camera and an automatic focusing module.This first camera takes pictures to produce one first image to a region.This second camera takes pictures to produce one second image to this region, wherein there is a parallax between this first image and this second image.This automatic focusing module adjusts the focal length of this first camera and this second camera according to this parallax.
The present invention more provides a kind of Atomatic focusing method.In one embodiment, an image processing system comprises a first camera, a second camera and an automatic focusing module.First, take pictures to produce one first image to a region with this first camera.Then, take pictures to produce one second image to this region with this second camera, wherein there is a parallax between this first image and this second image.Then, adjust the focal length of this first camera and this second camera according to this parallax with this automatic focusing module.
In order to above and other object of the present invention, feature and advantage can be become apparent, several preferred embodiment cited below particularly, and coordinate appended diagram, be described in detail below:
Accompanying drawing explanation
Fig. 1 be according to of the present invention can the block diagram of image processing system of auto-focusing;
Fig. 2 is the flow chart according to Atomatic focusing method of the present invention;
Fig. 3 A is the schematic diagram of the parallax of the target piece of the shorter distance of tool;
Fig. 3 B is the schematic diagram of the parallax of the target piece of the longer distance of tool; And
Fig. 4 is according to the schematic diagram choosing target piece from image of the present invention.
[main element symbol description]
(Fig. 1)
100 ~ image processing system;
102,104 ~ camera;
106 ~ image processing apparatus;
112 ~ synchronization module;
114 ~ adjusting module;
116 ~ depth map generation module;
110 ~ image processor;
118 ~ automatic focusing module;
(Fig. 3 A/ Fig. 3 B)
350,352 ~ target piece;
302,304 ~ camera.
Embodiment
Fig. 1 be according to of the present invention can the block diagram of image processing system 100 of auto-focusing.In one embodiment, image processing system 100 comprises camera 102 and 104 and image processing apparatus 106.Image processing apparatus 106 comprises synchronously (synchronization) module 112, adjustment (rectification) module 114, automatic focusing module 118 and image processor 110.In one embodiment, image processor 110 also comprises a depth map generation module 116.Camera 102 and 104 is connected to image processing system 106.Camera 102 takes pictures to produce one first image to a region.Camera 104 takes pictures to produce one second image to this region.In one embodiment, first camera 102 can be taken pictures with this region of different focal lengths from second camera 104, also can take pictures with this region of identical focal length.In one embodiment, first camera 102 and second camera 104 are parallel side-by-side, and produce a 3D diagram to a target piece or 3D makes video recording.Synchronization module 112 makes camera 102 and 104 reach synchronous to the first image with the shooting of the second image, and in conjunction with the first image and the second image to produce a joint image.Adjustment (imagerectification) module 114 revises the first image from the second image because different the caused distortion (distortion) in visual angle is to produce an adjustment image.Image processor 110 carries out image procossing to adjustment image.
Depth map generation module 116 produces a depth map (depthmap) according to the first image after synchronization module 112 synchronous adjustment and the parallax information between the second image.Different the caused difference in visual angle because of camera 102 and 104 is there is between the first image from the second image, and the difference existed between the first image and the second image is converted into the parallax information corresponding to and adjust each pixel of image by depth map generation module 116, more further the parallax information of each pixel is converted to range information corresponding to each pixel.In one embodiment, the camera lens of camera 102 and camera 104 is towards same direction, and the camera lens of camera 102 and camera 104 is at a distance of a fixed range.Because the camera lens of camera 102 and camera 104 is at a distance of a fixed range, the position of same object in the first image captured by camera 102 and the second image captured by camera 104 can be slightly different, and the gap of this position is referred to as parallax (visualdifference).Therefore, the depth map that produces of depth map generation module 116 is with the parallax information between the first image and the second image.
In one embodiment, depth map generation module 116 chooses a target piece in the first image and the second image, and determines the parallax between the first image and the second image by the gap of target piece image space in the first image and the second image.Because the parallax size of target piece and the distance of target piece are inversely proportional to, the distance of the estimating target object that therefore depth map generation module 116 can be definite and the central point of camera 102 and 104.Depth map generation module 116 produces depth map (depthmap) according to this parallax, and wherein this depth map comprises the object distance (camera-to-subjectdistance) of this target piece in this region relative to image processing system 106.In one embodiment, depth map generation module 116 determines the focal length of first camera 102 and second camera 104 according to this object distance.
The depth map that depth map generation module 116 produces is sent to automatic focusing module 118.Automatic focusing module 118 according to depth map with parallax information adjustment first camera 102 and the focal length of second camera 104.Then, automatic focusing module 118 more according to the focal length of the distance adjustment camera 102 and 104 of estimated target piece, clearly can focus on the first image and the second image to make the image of target piece.In one embodiment, automatic focusing module 118 comprises a voice coil motor to adjust the focal length of this first camera and this second camera.In one embodiment, automatic focusing module 118 produces the first focus control signals and the second focus control signals respectively, to control the focus process of camera 102 and 104.Due to the distance of automatic focusing module 118 known target object, just can calculate target piece rapidly and image in focal length on the photo-sensitive cell of camera 102 and 104, and the focal length of camera 102 and 104 is adjusted.Therefore, image processing system 100 need not as adjusting focal length of pulling in trial and error as known focus process, and the time of at substantial.Therefore, the time needed for focus process of image processing system 100 of the present invention can significantly shorten, and promotes the usefulness of image processing system 100.
Fig. 2 is the flow chart according to Atomatic focusing method 200 of the present invention.First, first camera 102 takes pictures to produce one first image (step 202) to a region.Then, second camera 104 takes pictures to produce one second image (step 204) to this region.Then, depth map generation module 116 produces a depth map (step 206) according to this first image and this second image, and wherein depth map comprises the parallax information be present between this first image and this second image.Then, depth map generation module 116 estimates the distance (step 208) of a target piece and this image processing system according to the parallax information of this depth map.In one embodiment, this distance is to the distance between the central point of this first camera and this second camera from this target piece.In one embodiment, when the parallax of target piece is larger, then the distance of the target piece estimated by automatic focusing module 118 is shorter; And when the parallax of target piece is less, then the distance of the target piece estimated by automatic focusing module 118 is longer.
Fig. 3 A is the schematic diagram of the parallax of the target piece 350 of the shorter distance of tool.Target piece 350 is positioned on the axis of camera 302 and 304.Target piece 350 is D with the distance of the central point of camera 302 and 304 1, therefore target piece 350 is shorter with camera 302 and 304 distance.Target piece 350 is D with the vertical range of the axis of camera 304 3.Therefore, the parallax angle [alpha] of target piece 350 and camera 304 2for tan -1(D 3/ D 1).Because the parallax angle [alpha] of target piece 350 and camera 302 2be equal to parallax angle [alpha] 1, therefore the total parallax angle of target piece 350 in the image captured by camera 302 and 304 is 2 × tan -1(D 3/ D 1).Fig. 3 B is the schematic diagram of the parallax of the target piece 352 of the longer distance of tool.Target piece 352 is positioned on the axis of camera 302 and 304.Target piece 352 is D with the distance of the central point of camera 302 and 304 2, therefore target piece 350 is longer with camera 302 and 304 distance.In like manner, the total parallax angle of target piece 352 in the image captured by camera 302 and 304 is 2 × tan -1(D 2/ D 1).Clearly, due to the distance D of the target piece 352 of Fig. 3 B 2be greater than the distance D of the target piece 350 of Fig. 3 A 1, the therefore total parallax angle 2 × tan of the target piece 352 of Fig. 3 B -1(D 3/ D 2) be less than the total parallax angle 2 × tan of the target piece 350 of Fig. 3 A -1(D 3/ D 1).Therefore, when the parallax of target piece is larger, then the distance of the target piece estimated by depth map generation module 116 is shorter; And when the parallax of target piece is less, then the distance of the target piece estimated by depth map generation module 116 is longer.
After depth map generation module 116 produces the estimated distance of target piece according to the parallax information of depth map, automatic focusing module 119 is according to this estimated distance adjustment first camera 102 and the focal length (step 210) of second camera 104.Generally speaking, first camera 102 and second camera 104 all have zoom lens (zoomlens), can convex lens in mat adjustment camera lens and the distance of concavees lens to change focal length, and the distance of convex lens in camera lens and concavees lens adjusts with stepper motor.In one embodiment, depth map generation module 116 calculates an estimation focal length according to the estimated distance of target piece, automatic focusing module 119 sends the zoom lens of focus control signals adjustment first camera 102 and second camera 104 again, meets this estimation focal length to make the focal length of first camera 102 and second camera 104.Therefore, target piece can form image clearly after the photo-sensitive cell being directly projected on camera 102 and 104.Finally, automatic focusing module 118 finely tunes to meet image definition (step 212) to the focal length of first camera 102 and second camera 104 again.
Fig. 4 is according to the schematic diagram choosing target piece from image 400 of the present invention.Image 400 can be the first image that camera 102 produces, the second image, the joint image of synchronization module 112 generation or the adjustment image of adjusting module 114 generation that camera 104 produces.First, image 400 is divided into multiple picture portion 401 ~ 409 by image processor 110.For example, image 400 can be split into upper left, upper, upper right, a middle left side, in, the middle right side, bottom left, lower in, nine picture portions such as bottom right.Then, image processor 110 is searched the particular zones in multiple picture portion and obtains target piece.Generally speaking, the picture portion 405 be positioned in the middle of image 400 is predetermined to be the particular zones of searching target object.But the user of image processing system 100 also can specify particular zones.In one embodiment, when image processor 110 searches particular zones, can human face recognition be carried out, and obtain target piece.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention; without departing from the spirit and scope of the present invention, when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the appended claims person of defining for any those skilled in the art.

Claims (18)

1. an image processing system, comprising:
One first camera, takes pictures to produce one first image to the target piece in a region with one first focal length;
One second camera, synchronously with this first camera take pictures to produce one second image with one second focal length this target piece to this region, wherein this first focal length is different from this second focal length, wherein this first camera and this second camera parallel side-by-side and the camera lens of this first camera and this second camera are towards same direction, and the camera lens of this first camera and this second camera is at a distance of a fixed range; And
One image processing apparatus, is coupled to this first camera and this second camera, in order to:
This target piece is chosen in this first image and this second image;
The parallax between this first image and this second image is determined by the gap of target piece image space in this first image and this second image;
According to the object distance of this target piece of this disparity estimation relative to this image processing apparatus; And
Produce a depth map according to this parallax, wherein this depth map comprises this object distance relative to this image processing apparatus of this target piece in this region.
2. image processing system as claimed in claim 1, wherein this first camera and this second camera are at diverse location to produce this parallax of this target piece between this first image and this second image, and this image processing apparatus more determines this first focal length of this first camera according to this object distance.
3. image processing system as claimed in claim 1, wherein this image processing apparatus comprises an image processor, in order to determine this parallax by the gap of this target piece image space in this first image and this second image.
4. image processing system as claimed in claim 3, wherein this image processor calculates the estimation focal length of this first camera according to this object distance.
5. image processing system as claimed in claim 4, wherein this image processing apparatus comprises automatic focusing module, in order to:
This first focal length of this this first camera of estimation Focussing calculated according to this image processor; And
Also this first focal length of this first camera is finely tuned, until this target piece meets a standard in the image definition of this first camera and this second camera.
6. image processing system as claimed in claim 5, wherein this automatic focusing module comprises a voice coil motor to adjust this first focal length of this first camera.
7. image processing system as claimed in claim 1, wherein when the parallax corresponding to this target piece is larger, this object distance of this target piece that this image processor produces is shorter; When the parallax corresponding to this target piece is less, this object distance of this target piece that this image processor produces is longer.
8. image processing system as claimed in claim 1, wherein this first image and this second image are divided into multiple picture portion, and this target piece is obtained by a particular zones of searching in the plurality of picture portion, wherein this particular zones can be and presets or specified by a user.
9. an Atomatic focusing method for image processing system, wherein this image processing system comprises a first camera, a second camera and an automatic focusing module, and this Atomatic focusing method comprises:
Take pictures to produce one first image to the target piece in a region with one first focal length with this first camera;
Synchronously with this first camera take pictures to produce one second image with one second focal length this target piece to this region with this second camera, wherein this first focal length is different from this second focal length, wherein this first camera and this second camera parallel side-by-side and the camera lens of this first camera and this second camera are towards same direction, and the camera lens of this first camera and this second camera is at a distance of a fixed range;
This target piece is chosen in this first image and this second image;
The parallax between this first image and this second image is determined by the gap of this target piece image space in this first image and this second image;
According to the object distance of this target piece of this disparity estimation relative to this image processing apparatus;
Produce a depth map according to this parallax, wherein this depth map comprises this object distance relative to this image processing apparatus of this target piece in this region.
10. Atomatic focusing method as claimed in claim 9, wherein this first camera and this second camera at diverse location to produce this parallax of this target piece between this first image and this second image.
11. Atomatic focusing methods as claimed in claim 9, also comprise:
This parallax is determined by the gap of this target piece image space in this first image and this second image.
12. Atomatic focusing methods as claimed in claim 11, also comprise:
According to this depth map to this target piece produce one 3D diagram or 3D make video recording.
13. Atomatic focusing methods as claimed in claim 12, also comprise:
The estimation focal length of this first camera is calculated according to this object distance.
14. Atomatic focusing methods as claimed in claim 13, also comprise:
With this automatic focusing module this first focal length according to this this first camera of estimation Focussing determined.
15. Atomatic focusing methods as claimed in claim 9, wherein this automatic focusing module comprises a voice coil motor to adjust this first focal length of this first camera.
16. Atomatic focusing methods as claimed in claim 9, also comprise:
Finely tune with this automatic focusing module this second focal length to this first focal length of this first camera and this second camera, until this target piece meets a standard in the image definition of this first camera and this second camera.
17. Atomatic focusing methods as claimed in claim 12, wherein when the parallax corresponding to this target piece is larger, this object distance of this target piece is shorter; When the parallax corresponding to this target piece is less, this object distance of this target piece is longer.
18. Atomatic focusing methods as claimed in claim 9, also comprise:
Divide this first image and this second image is multiple picture portion; And
Search the particular zones in the plurality of picture portion and obtain this target piece, wherein this particular zones can be and presets or specified by a user.
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